I really like the first three and the one of the shade structure (second to last). They are full of rich color and beautiful contrast - the kind that brings out all the detail in all its glory. The composition is strong in the above images, but it stands out to me in the ones I just mentioned. The dramatic weather is a welcome and captivating bonus.

Heh, that window up at the top of the third image is pretty cool, too.
As far as critique goes, I'm going to have to agree with Markshannon and daskibum, though the HDR looks by-and-large fine to me. It could use some tweaking here and there, but your average viewer isn't going to notice the uneven distribution of light in some of the pictures.
What grabs my eye is either the LucisArts program or something weird you're doing in PS. To me, the images have this odd mixture of soft-focus and oversharpened effects applied (especially when I look at the foliage). There's definitely something that is causing the "grainyness" (though I put that in quotes, because it's not your standard film/noise grain) that Mark mentioned and the unnatural colors daskibum mentioned (both of which I can sorta see). Aside from the LucisArt program, it is possible that the usage of unsharp mask with a large radius (>2 or 3) can produce a similar effect to what I'm seeing here.
On the other hand, I don't see anyone else doing what you're doing. It does make your work stand out with a distinctive style. I know you said you used to be into illustration, so you know how important that is.

Beautiful work all around though, don't let my critique rub ya the wrong way.